Could Mars ever have lightning, even in its thin air? A new analysis says yes, at least on a small scale, with direct signs of electrical discharges recorded at the planet’s surface.
The signals were picked up by a microphone on the Perseverance rover during whirlwinds and storm fronts, revealing 55 events across two Martian years, about four Earth years. The results point to blowing dust building up static electricity that can “jump” as a discharge, with ripple effects for chemistry, climate, and future exploration.
A long-running Mars mystery gets a real signal
For decades, scientists have argued about whether Mars can produce anything like lightning. The planet’s atmosphere is far thinner than Earth’s and is mostly carbon dioxide, which changes how electricity behaves.
The new peer-reviewed study, led by Baptiste Chide of the University of Toulouse, reports the first in-place detections of these discharges in data collected by Perseverance. The research team includes Ralph D. Lorenz from the Johns Hopkins Applied Physics Laboratory and other international collaborators.
A related News & Views article by Daniel Mitchard at Cardiff University says the pattern is characteristic of lightning inside dust storms. It is a big step for a question that has been mostly theory and indirect hints until now.
How a microphone caught electricity, not just wind
Perseverance carries the SuperCam instrument, whose investigation is led by Roger C. Wiens at Purdue University, and it includes a mast-mounted microphone originally meant to study sounds from the rover’s laser and the Martian wind. NASA has highlighted the microphone as a way to “listen” to conditions on Mars. Perseverance’s mast microphone
The researchers searched over 30 hours of recordings and found 55 events with a distinctive pattern, including seven captured start-to-finish. Each one started with electromagnetic interference, the kind of static that can mess with electronics, followed by a small, thunder-like pop roughly eight milliseconds later.
That delay is a clue. Electricity can disrupt electronics instantly, while sound needs a fraction of a second to travel through the air and reach a microphone.
Static electricity, Martian style
The key process is “triboelectric” charging, a scientific term for static electricity created by friction. It is the same basic idea as rubbing a balloon on your hair or getting a shock from a metal doorknob in dry weather.
On Mars, the rubbing happens when dust grains collide and scrape past each other in turbulent winds. Dust devils can be a few feet to a few hundred feet across, and dust storms can stretch hundreds of miles.
Over time, some grains pick up extra electrons, others lose them, and the growing imbalance creates an electric field in the air. When the field gets strong enough, the air stops insulating and the charge finds a shortcut as a spark, likely forming arcs only an inch or two long.
Why these sparks are nothing like a thunderstorm on Earth
Most of the events were extremely small. The team estimated energies from about one-tenth of a nanojoule up to 150 nanojoules, and a nanojoule is a billionth of a joule.
One outlier reached roughly 40 millijoules, still only about four-hundredths of a joule. By comparison, a typical lightning flash on Earth can involve billions of joules, which helps explain why these Martian signals sound more like clicks than booms.
The discharges also appeared in specific weather. They were usually tied to dust devils and the leading edges of dust storms, not just to dusty air sitting still, which suggests motion and turbulence are the real trigger.
What it could mean for methane and organic molecules
Why care about tiny sparks that barely register on a microphone? Because even small electrical events can drive chemical reactions, especially in an atmosphere that is already chemically reactive.
In an official press release from the Institut de Recherche en Astrophysique et Planétologie, researchers argue that discharges could help form highly oxidizing compounds. Oxidizers are chemicals that readily break other molecules apart, including organics that scientists hope to detect as possible traces of past life.
The same press release suggests the process might play a role in the long-running debate over methane on Mars, because reactive chemistry can destroy methane faster than expected. That idea is still a hypothesis, but it points to a practical reason to map where and when these discharges happen.
A practical concern for robots and future crews
Electrical activity is not only a chemistry story. Static discharges can interfere with electronics, and Mars missions already battle dust that sticks, clogs, and coats surfaces.
For robotic explorers, a spark in the wrong place could mean false readings or, in the worst case, damage to sensitive components. For humans, it raises questions about how spacesuits, habitat materials, and tools might handle repeated charging in dusty storms.
It also connects to how dust moves in the first place. Electric forces can make fine particles clump or repel each other, which could subtly change how dust lifts off the ground and how storms evolve over time.
What scientists will look for next
The study was based on “serendipitous” detections, partly because the microphone records in short clips rather than continuously. That means the 55 recorded events are probably not the full story, just the part that happened to be captured.
The underlying rover datasets are publicly available through the Planetary Data System, which could let other researchers hunt for more events. With more eyes on the data, scientists can also test whether the sparks follow seasons or specific wind patterns.
Meanwhile, earlier work on Mars acoustics and dust devils gives scientists a playbook for what to listen for. A related open-access paper, The sound of a Martian dust devil, showed how audio can reveal wind structure and grain impacts, which now seems even more useful.
The main study has been published in Nature.
